CIE Biology Paper-4: Specimen Questions 77 - 80 of 120

Question number: 77

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If, a person is suffering from DNA deficiency. How will he be cured?

Explanation

Person can be cured by the help of gene therapy. In such therapy, ADA gene has taken from the leucocytes of a healthy person and inserted it into a retrovirus than it is injected to the lymphocyte stem cells of patient along with helper virus. Lymphocytes generated by these stem cells had normal ADA gene. Permanent cure can be done when functional ADA gene is introduced in cell of early embryo.

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Explanation

Photosynthesis process and respiration occur.

Photosynthesis-It is a process, which is used by plants and other organisms to convert light energy into chemical energy.

Respiration- Respiration is a process, which occur inside the living cells of every type of organism. It is the sum total of the physical and chemical processes in an organism by which oxygen is transfer to tissues and cells, and the oxidation products, carbon dioxide and water, are given off.